Clarence-Rockland is a city in Eastern Ontario, Canada, in the United Counties of Prescott and Russell on the Ottawa River. Clarence-Rockland, located immediately to the east of Ottawa, was formed on January 1, 1998, through the amalgamation of the Town of Rockland with Clarence Township.

The geographic Township of Clarence was established in 1798 and named after Prince William Henry, Duke of Clarence. Communities were established in the township since the early 1840s. In July 1853, the Township Municipality of Clarence was created when it separated from the United Township of Russell, Cambridge and Clarence. Rockland was incorporated as a town in 1908.

The city includes the communities of Bourget, Cheney, Clarence, Clarence Creek, Hammond, Rockland, and Saint-Pascal-Baylon. The city administrative offices are located in Rockland, which is the largest community in the region.

In the 2021 Census of Population conducted by Statistics Canada, Clarence-Rockland had a population of 26,505 living in 10,095 of its 10,316 total private dwellings, a change of 8.1% from its 2016 population of 24,512. With a land area of 297.47 km² (114.85 sq mi), it had a population density of 89.1/km² (230.8/sq mi) in 2021.

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Clarence-Rockland Transpo provided a public transportation service to residents of the city; part of the Rural Partners Transit Service. This service consisted of bus routes 530 and 535, ran by Leduc Bus Lines. These routes connected many of the communities within Clarence-Rockland and Ottawa. Both routes have been indefinitely suspended since the COVID-19 pandemic due to safety concerns and low demand.